<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">

    <title></title>
    <style>
        .parent {
            height: 150px;
            line-height: 150px;
            font-size: 0;
            background: blue;
        }

        .son {
            vertical-align: middle;
        }

        /*默认是基线对齐，改为middle*/
    </style>
</head>
<body>

<div class="parent">
    <img src="../images/yjkh_success.png" class="son"/>
</div>
</body>
</html>